github.com/diadata-org/diadata@v1.4.593/pkg/dia/helpers/substrate-helper/gsrpc/rpc/state/get_storage.go (about)

     1  // Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
     2  //
     3  // Copyright 2019 Centrifuge GmbH
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  package state
    18  
    19  import (
    20  	"github.com/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/client"
    21  	"github.com/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/types"
    22  	"github.com/diadata-org/diadata/pkg/dia/helpers/substrate-helper/gsrpc/types/codec"
    23  )
    24  
    25  // GetStorage retreives the stored data and decodes them into the provided interface. Ok is true if the value is not
    26  // empty.
    27  func (s *state) GetStorage(key types.StorageKey, target interface{}, blockHash types.Hash) (ok bool, err error) {
    28  	raw, err := s.getStorageRaw(key, &blockHash)
    29  	if err != nil {
    30  		return false, err
    31  	}
    32  	if len(*raw) == 0 {
    33  		return false, nil
    34  	}
    35  	return true, codec.Decode(*raw, target)
    36  }
    37  
    38  // GetStorageLatest retreives the stored data for the latest block height and decodes them into the provided interface.
    39  // Ok is true if the value is not empty.
    40  func (s *state) GetStorageLatest(key types.StorageKey, target interface{}) (ok bool, err error) {
    41  	raw, err := s.getStorageRaw(key, nil)
    42  	if err != nil {
    43  		return false, err
    44  	}
    45  	if len(*raw) == 0 {
    46  		return false, nil
    47  	}
    48  	return true, codec.Decode(*raw, target)
    49  }
    50  
    51  // GetStorageRaw retreives the stored data as raw bytes, without decoding them
    52  func (s *state) GetStorageRaw(key types.StorageKey, blockHash types.Hash) (*types.StorageDataRaw, error) {
    53  	return s.getStorageRaw(key, &blockHash)
    54  }
    55  
    56  // GetStorageRawLatest retreives the stored data for the latest block height as raw bytes, without decoding them
    57  func (s *state) GetStorageRawLatest(key types.StorageKey) (*types.StorageDataRaw, error) {
    58  	return s.getStorageRaw(key, nil)
    59  }
    60  
    61  func (s *state) getStorageRaw(key types.StorageKey, blockHash *types.Hash) (*types.StorageDataRaw, error) {
    62  	var res string
    63  	err := client.CallWithBlockHash(s.client, &res, "state_getStorage", blockHash, key.Hex())
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  
    68  	bz, err := codec.HexDecodeString(res)
    69  	if err != nil {
    70  		return nil, err
    71  	}
    72  
    73  	data := types.NewStorageDataRaw(bz)
    74  	return &data, nil
    75  }